Population Structure Analysis of Carbapenem-Resistant Acinetobacter baumannii Clinical Isolates from Brazil Reveals Predominance of Clonal Complexes 1, 15, and 79

The population structure of 71 carbapenem-resistant Acinetobacter baumannii clinical isolates from several hospitals in Brazil was investigated by ApaI pulsed-field gel electrophoresis, blaOXA-51-like subtyping, and multilocus sequence typing (Institute Pasteur scheme). In addition to the predominance of strains carrying blaOXA-23, we detected the presence of blaOXA-72 and blaOXA-231. We observed a predominance of clonal complex 1 (CC1), CC15, and CC79 and representative strains of the worldwide-disseminated international clone I.